Возможность и целесообразность учета частотных зависимостей... 93 sult of this conversion, frequency bands lower than 500 Hz mostly affect the value of speech intelligibility; since it is in this interval that equal loudness contours are not parallel to each other. The second approach is based on the use of various function of perception coefficient calculation for each octave band suggested by A.N. Prodeus. As a result, the speech intelligibility value decreases, which needs validation, and contradicts numerous experimental results obtained earlier. These experiments reveal that in modern conditions (connected texts, a possibility of repeated listening, noise cleaning) the speech intelligibility significantly increases in comparison with N.B. Pokrovsky's results (the technique was developed for assessing the quality of communication lines). As a result, the question of the necessity to choose an approach to the accounting of the influence of frequency characteristics arises. In addition, it may be necessary to experimentally revise the dependence of the perception coefficient function on the level of perception by taking modern conditions of information security into account.

The solution to the problem of managing the cost of an investment and construction project under conditions of risk and uncertainty is presented in the issue. The external and internal factors of project risks are analyzed. The concept of uncertainty is characterized as a property of the external and internal environment of the project, which underlies the occurrence of risks. Additional prerequisites for the emergence of risks, both objective and subjective, are considered. An authors’ model for managing the cost of an investment and construction project based on a process approach has been developed based on the above mentioned prerequisites. The content of the stages of the project cost management model has been determined. The possibility of managing the cost of the project through the analysis of budget spending has been investigated. In the course of the study, a comparison was made between the work schedule in accordance with the basic project plan and the actual work schedule with deviations from the project plan. Unfavorable deviations of the baseline indicators of the project were revealed, both in terms of work execution time and in the cost of work performed. It has been proved that the adverse impact of risk factors on the overall performance of the project, expressed by indicators of investment efficiency, is reduced as a result of the application of the process model for managing the cost of an investment and construction project.

No abstract